Ken's POTW

Alphabetical Numbers

What numbers, when written alphabetically (i.e. "one", "two", etc.),
have their letters in alphabetical order?

The numbers from 1 (one) to 1,000,000 (one million) are written
alphabetically, then they are put in alphabetical order. [In this
puzzle, consider spaces to come before the letter a.
For example, "Nine thousand, four hundred, thirty-six" comes
before "Nineteen".]